Riveting-machine.



No. 657,904. Patented Sept. ll, I900.

C. H. JOHNSON.

RIVETING MACHINE.

(Application filed Dec. 15, 1897.)

(No Model.)

Unrrnn STATES PATE T (lemon.

CHARLES HARRIS JOHNSON, or SPRINGFIELD, ILLINOIS.

RIVETING-MACHINE;

srEcIFIc-ATIQN forming past of Letters Patent No. 657,904, aaeaSeptember 11, 19oo.

Application filed December 15, 1897. Serial No. 661,932. (No model.)

To all whom, it may concern/.-

Be it known that 1, CHARLES HARRIS J OHN- SON, a citizen of the UnitedStates, residing at Springfield, Illinois, have invented certain new anduseful Improvements in Riveting- Machines, of which the following is aspecification.

My invention has more particular reference to what are known as yokerivetingmachines, where the riveting is done with a reciprocating orpercussion hammer; and it has for its object to relieve the yoke fromthe strain and jar given by the blows of the hammer; and my inventionconsists in the features and details of construction hereinafterdescribed and claimed.

In the drawing 1 have represented a broken longitudinal sectionalelevation of my improved riveting-machine.

In making my improved riveting-machine I make a yoke A, which may bemade of the desired size and material. I make a cylinder B, providedwith a laterally-extending socket B, adapted to fit over one end of theyoke and to be riveted or otherwise attached thereto, as shown in thedrawing. I reduce the interior diameter of the cylinder B a desireddistance, as at 6, providing a shoulder Z). I arrange in the cylinder ahammer-piston C of a diameter to fit within the reduced diameter of thecylinder B, but provided with an enlarged head 0, having a shoulder c.Ihe hammer-piston O is provided with an interior recess C at what I termits outer end, into which ports 0 lead. The cylinder B is also providedwith a discharge-port I)", as shown in the drawing. When the piston isin its in or advanced position, the shoulders I) and c are in proximityto each other. A pipe D leads from a source of fluid-supply, as steam orcompressed air, and opens into cylinder B between the shoulders I) and 0through a port (Z. Valve mechanism, as D, may be employed for admittingor excluding the air or other motive fluid. In operation the compressedair or other motive fluid in the cylinder B between the shoulders b andc forces the hammer-piston back or out until the ports 0 pass theshoulder b, when the air or other motive fluid that ,has been operatin gbetween the shoulders b and 0 passes through the ports 0 into recess 0,so as to operate between the outer end of the cylinder and the outer endof the piston and cause the piston to again be advanced or moved in. Asthe hammer-piston moves in the ports 0 discharge into the inner spaceleading to the exhaust-port b and allow the air that had passed inbehind the outer end of the piston to escape. At the other end of theyoke I arrange another cylinder E, provided with a lateral socket E,permitting it to be attached by riveting or in any other desirable wayto the end of the yoke to which it belongs. I arrange a hold-on pistonFin the cylinder and lead a pipe F from a source of. compressed air orother motive fluid into the cylinder behind the hold-on piston, so thatby admitting the motive fluid the hold-on piston can be advanced adesired distance and held inits advanced position by the compressed airbehind it. Of course it will be understood that the front end of the hammer-cylinder carries a rivet'die O and that the hold-on piston F carriesa second rivet-die W, as shown in the drawing.

In operation the plates intended to be riveted are placed between therivet-dies with the rivet in place and its head toward the rivet-die FThe compressed air or other motive fluid is now admitted through thepipe F and the hold-on piston F advanced until its rivet-die restsagainst the head of the rivet. The air or other motive fluid is thenintroduced through the pipe D into the cylinder B, so that thehammer-piston is reciprocated, as already described, so as to administera series of rapid and sharp blows on the end of the rivet-die 0 As theseblows are administered the hold-on piston F, with its rivet-die, isallowed to give or yield on its cushion of compressed air sufficientlyto relieve the yoke from the jar and strain that it would be subjectedto were not the yielding cushion provided behind the hold-on piston F toreceive the impact of the blows administered by the hammer.

What I regard as new, and desire to secure by Letters Patent, is

1. In a portable riveter, the combination of a bifurcated yoke, one endof which has a fluid-pressure cylinder in which a clampingpiston isreciprocatingly mounted and the other end with a cylinder having apercuscylinder and a hammer-piston, a rivet-die 10 supported by thecylinder of the hammerpiston, and fluid-pressure means for causing thesaid ham me'r and hold-on to automatically clamp and hold the rivetbetween the rivet dies during the operation of the pneumatic hammer.

CHARLES HARRIS JOHNSON.

Witnesses:

WM. BARRET RIDGELY, FRANKLIN RIDGELY;

